ECU MERCEDES-BENZ S550 2007 W221 Service Manual

339 Controls in detail
Fastening the seat belts
Fastening the seat belts
Warning!
G
Always fasten your seat belt before driving
off. Always make sure all of your passengers
are properly restrained, even those sitting in
the rear and pregnant women.
Failure to wear and properly fasten and
position your seat belt greatly increases
your risk of injuries and their likely severity
in an accident. You and your passengers
should always wear seat belts.
If you are ever in an accident, your injuries
can be considerably more severe without
your seat belt properly buckled. Without
your seat belt buckled, you are much more
likely to hit the interior of the vehicle or be
ejected from it. You can be seriously injured
or killed.
In the same crash, the possibility of injury or
death is lessened if you are wearing your
seat belt. The air bags can only provide the
protection they were designed to afford if
the occupants are using their seat belts
(page 45).
Warning!
G
According to accident statistics, children
are safer when properly restrained in the
rear seating positions than in the front seat-
ing position. Thus, we strongly recommend
that children be placed in the rear seats
whenever possible. Regardless of seating
position, children 12 years old and under
must be seated and properly secured in an
appropriate infant, or toddler restraint, or
booster seat recommended for the size and
weight of the child. For additional informa-
tion, see “Children in the vehicle”
(page 61).
A child’s risk of serious or fatal injuries is
significantly increased if the child restraints
are not properly secured in the vehicle and
the child is not properly secured in the child
restraint.Warning!
G
Never let more people ride in the vehicle
than there are seat belts available. Be sure
everyone riding in the vehicle is correctly re-
strained with a separate seat belt. Never use
a seat belt for more than one person at a
time.

340 Controls in detailFastening the seat belts
1Belt outlet
2Latch plate
3Buckle
4Release button
Pull the seat belt smoothly from the
seat belt outlet 1.

Place the shoulder portion of the belt
across the top of your shoulder and the
lap portion across your hips.

Push latch plate2 into buckle3 until
it clicks.

If necessary, tighten the lap portion to
a snug fit by pulling shoulder portion
up.

To release the seat belt, press release
button4 and guide latch plate back to
belt outlet.
Warning!
G
Never ride in a moving vehicle with the seat
backrest in an excessively reclined position
as this can be dangerous. You could slide
under the seat belt in a collision. If you slide
under it, the belt would apply force at the ab-
domen or neck. That could cause serious or
even fatal injuries. The seat backrest and
seat belt provide the best restraint when the
wearer is in a nearly upright position and the
belt is properly positioned on the body.Warning!
G
Read and observe the additional warning no-
tices printed in the “Safety and Security”
section (
page 44).

341 Controls in detail
Fastening the seat belts
Proper use of seat belts

Do not twist the belt when fastening.


Adjust seat belt so that the shoulder
portion is located as close as possible
to the middle of the shoulder (it should
not touch the neck). Never pass the
shoulder portion of the belt under your
arm.


Position the lap belt as low as possible
on your hips (over hip joint) and not
across the abdomen.


Place the seat backrest in a nearly up-
right position.


Never use a seat belt for more than one
person at a time.


Do not fasten a seat belt around a per-
son and another object at the same
time. When using a seat belt to secure
infant or toddler restraints or children
in booster seats, always follow the
child seat manufacturer’s instructions.


Check your seat belt during travel to
make sure that it is properly posi-
tioned.


Make sure the seat belt is always fitted
snugly. Take special care of this when
wearing loose clothing.For more information, see “Seat belts”
(
page 55).
Seat belt height adjustment
The vehicle automatically adjusts the seat
belt height for the driver’s and front pas-
senger’s seats as well as for the rear outer
seats. Comply with the instructions on how
to properly fasten a seat belt
(page 339).
Warning!
G
Do not pass belts over sharp edges. They
could tear.
Do not allow the belt to get caught in the
door or in the seat adjustment mechanism.
This could damage the belt.
Never attempt to make modifications to
seat belts. This could impair the effective-
ness of the belts.
Do not bleach or dye seat belts as this may
severely weaken them. In a crash, they may
not be able to provide adequate protection.
Damaged seat belts or belts that were highly
stressed in an accident must be replaced.
Contact an authorized Mercedes-Benz Cen-
ter.

346 Controls in detailLightingLocator lighting and night security illu-
mination
Locator lighting and night security illumi-
nation are described in the COMAND vehi-
cle section under “Setting locator lighting”
(page 221) and “Setting night security il-
lumination” (
page 220).
Headlamp cleaning system
1Headlamp washer button

Switch on the ignition (
page 315).

Press button1.
The headlamps are cleaned with a
high-pressure water jet.For information on filling up the washer
reservoir, see “Windshield washer system
and headlamp cleaning system”
(
page 498).
Combination switch
1High beam
2High beam flasher
Switching on high beams
Turn exterior lamp switch to
positionB or to*
(page 342).

Push the combination switch in the
direction1.
The high beam indicatorA on the
instrument cluster comes on.
i
The headlamps are automatically cleaned if,
at the same time,


the engine is running


the lights are switched on


the windshield wipers have wiped the wind-
shield with washer fluid 15 times
When you switch off the ignition or press
button1, the automatic function is reset and
will start counting the next time from the begin-
ning.

370 Controls in detailAutomatic transmissionAutomatic transmission positions
The current automatic transmission posi-
tion appears in the tachometer display.
1Current automatic transmission posi-
tion!
If the automatic transmission position fails
in the tachometer display, you should check
whether the gear selector lever is placed in the
desired position while driving off with added cau-
tion. We recommend you to shift the gear selec-
tor lever to positionD. Do not limit the gear
range.
Effect
ì
Park position
Shift into park positionP only
when vehicle is stopped. The
park position is not intended to
serve as a brake when the vehi-
cle is parked. Rather, the driver
should always set the electric
parking brake in addition to shift-
ing into park positionP to secure
the vehicle.
If the vehicle’s electrical system
is malfunctioning, the automatic
transmission could remain
locked in park positionP.
Have the vehicle checked as
soon as possible by an autho-
rized Mercedes-Benz Center.
!
SmartKey:
If you turn off the engine using the SmartKey and
remove the SmartKey from the starter switch,
the automatic transmission will shift to park
positionP automatically. Keep in mind that turn-
ing off the engine with the SmartKey alone will
not automatically shift the automatic transmis-
sion to park positionP. Only when the SmartKey
is removed from the starter switch, will the auto-
matic transmission automatically shift to park
positionP.
KEYLESS-GO*:
If you turn off the engine using the KEYLESS-GO
start/stop button and open the driver’s door, the
automatic transmission will shift to park
positionP automatically. Keep in mind that turn-
ing off the engine using the KEYLESS-GO
start/stop button alone will not automatically
shift the automatic transmission to park
positionP. Only when the driver’s door is
opened, will the automatic transmission auto-
matically shift to park positionP.
DISTRONIC Plus*:
the transmission will shift to park positionP au-
tomatically, only when DISTRONIC Plus brings
your vehicle to a standstill, and when it meets at
least one of the following conditions at the same
time:

the engine is turned off


the driver’s or passenger door opens and the
seat belt is not engaged in the buckle
In addition to shifting to park positionP, the elec-
tric parking brake will be engaged automatically.

381 Controls in detail
Driving systems
1Setting current or higher speed
Adjustment in 1 mph increments (to re-
sistance point) or 5 mph increments
(past resistance point)
(Canada: 1 km/h or 10 km/h)
2Setting current or lower speed
Adjustment in 1 mph increments (to re-
sistance point) or 5 mph increments
(past resistance point)
(Canada: 1 km/h or 10 km/h)
3Cancel cruise control
4Resume to last set speedActivating cruise control
You can activate cruise control if the vehi-
cle speed is above 20 mph (30 km/h).
In the following cases you cannot activate
cruise control:


when you brake


the vehicle is secured with the electric
parking brake


if the automatic transmission is set to
positionP, R, or N


if ESP
® is switched off
Setting current speed

Accelerate or decelerate to the desired
speed.

Briefly lift the cruise control lever in
direction of arrow1 or depress in
direction of arrow2.
The current speed is set.
Warning!
G
Cruise control brakes automatically so that
the set speed is not exceeded. The brake
pedal depresses when cruise control engag-
es the brakes.
Keep driver’s foot area clear at all times, in-
cluding the area under the brake pedal. Ob-
jects stored in this area may impair pedal
movement which could interfere with the
braking ability of the cruise control system.
Do not place your foot under the brake pedal
– your foot could become caught.
Keep in mind that cruise control is a conve-
nience system designed to assist the driver
during vehicle operation. The driver is and
must always remain responsible for the ve-
hicle’s speed and for safe brake operation.


382 Controls in detailDriving systems
Remove your foot from the accelerator
pedal.
Cruise control is activated.

The last set speed appears in the
multifunction display for approxi-
mately 5 seconds.


The corresponding speedometer
segments from the selected speed
to the vehicle maximum speed in
the multifunction display are illumi-
nated.


The set speed is shown by a triangle
in the speedometer.Canceling cruise control
There are several ways to cancel cruise
control:

Step on the brake pedal.
Cruise control is canceled. The last
speed set is stored for later use.
or

Briefly push the cruise control lever in
direction of arrow3.
Cruise control is canceled. The last
speed set is stored for later use.
i
On uphill grades, cruise control may not be
able to maintain the set speed. Once the grade
eases, the set speed will be resumed.
On downhill grades, cruise control maintains the
set speed with braking from the vehicle’s braking
system. In addition, on longer downhill grades
the automatic transmission will automatically
downshift.
i
Upon switching off the engine, the last
stored speed is deleted.
i
Cruise control switches off automatically
when


you step on the brake pedal


the vehicle is secured with the parking brake
In this case the segments in the multifunc-
tion display go out and no warning sounds.


the vehicle speed is below 20 mph
(30 km/h)


the ESP
® is in operation or switched off with
the ESP® switch (
page 73)


you set the automatic transmission toN
while driving
The segments in the multifunction display go out,
and an acoustic warning sounds.
!
Setting the automatic transmission toN
while driving cancels cruise control. However,
the automatic transmission should not be set
toN while driving except to coast when the vehi-
cle is in danger of skidding (e.g. on icy roads).
i
Depressing the accelerator pedal does not
deactivate cruise control. After brief accelera-
tion (e.g. for passing), cruise control will resume
the last speed set.


390 Controls in detailDriving systemsDISTRONIC Plus lever
The DISTRONIC Plus system is operated by
means of the DISTRONIC Plus lever.
1Setting current or higher speed
Adjustment in 1 mph or 5 mph
increments (Canada: 1 km/h or
10 km/h)
2Setting current or lower speed
Adjustment in 1 mph or 5 mph
increments (Canada: 1 km/h or
10 km/h)
3Canceling DISTRONIC Plus
4Activating DISTRONIC Plus or resum-
ing to last set speed
5Setting target distanceActivating DISTRONIC PlusYou can activate DISTRONIC Plus when:


you are driving slower than 20 mph
(30 km/h) and DISTRONIC Plus has
detected a vehicle ahead of you


you are driving above 20 mph
(30 km/h)
If DISTRONIC Plus has not been activated
after pressing the DISTRONIC Plus lever,
you will see the message: “DISTRONIC
PLUS Off” in the multifunction display.
In the following cases you cannot activate
DISTRONIC Plus:


up to 2 minutes after starting the en-
gine


if the engine is switched off


if you step on the brake pedal while
driving


the vehicle is secured with the electric
parking brake
Warning!
G
When DISTRONIC Plus is braking, the brake
pedal is retracted (i.e. depressed automati-
cally). The pedals’ range of motion must not
be impeded by any obstacles:

Do not place any objects in the footwell.


Make sure that the floor mats and car-
pets are securely in place.


Do not rest your foot underneath the
brake pedal, as it could otherwise be
trapped.
You could otherwise cause an accident and
injure yourself and others.
Warning!
G
When DISTRONIC Plus is switched on, the
vehicle can be braked. You should therefore
switch off DISTRONIC Plus if the vehicle
must be towed.
i
The maximum speed you can set is 124 mph
(200 km/h).

392 Controls in detailDriving systemsStarting off
When the vehicle in front of you starts off:
Remove your foot from the brake
pedal.

Pull DISTRONIC Plus lever briefly in di-
rection of arrow4.
or

Briefly step on the accelerator pedal.
Your vehicle starts off and adapts its speed
to the vehicle in front of you.
Driving
If no vehicle is driving ahead of you, DIS-
TRONIC Plus functions like cruise control
(
page 380).
When DISTRONIC Plus detects that the ve-
hicle in front of you is driving more slowly,
it brakes the vehicle in order to keep the
distance specified by you.
When DISTRONIC Plus detects that the ve-
hicle in front of you is driving faster, the ve-
hicle accelerates up to the set speed.Stopping
When DISTRONIC Plus detects that the ve-
hicle in front of you is stopping, the vehicle
brakes until it also stops.
Warning!
G
When you step on the brake pedal, you
switch off DISTRONIC Plus except when the
vehicle is at a standstill. DISTRONIC Plus will
no longer brake your vehicle. You are always
responsible for maintaining a distance from
other vehicles, observing road speeds and
braking well in advance.Warning!
G
DISTRONIC Plus’s braking effect is canceled
and the vehicle can start to roll if

DISTRONIC Plus is switched off using
the DISTRONIC Plus lever


you accelerate


the system or the power supply is mal-
functioning, e.g. due to battery failure


the electrical components in the engine
compartment or the fuses have been
manipulated


the battery is disconnected
Warning!
G
Never get out of the vehicle while DISTRON-
IC Plus is switched on!
DISTRONIC Plus must never be operated or
switched off by passengers or from outside
the vehicle.
DISTRONIC Plus is not a substitute for the
electric parking brake and may not be used
for parking.
When you get out of the vehicle or switch off
the engine, deactivate DISTRONIC Plus and
secure the vehicle from rolling away by en-
gaging the electric parking brake.

393 Controls in detail
Driving systems
Once DISTRONIC Plus has stopped your
vehicle and it is at a standstill, it remains
stationary; the brake pedal does not need
to be depressed.
Setting the current speed
Accelerate or decelerate to the desired
speed.

Briefly lift the DISTRONIC Plus lever in
the direction of arrow1 or depress in
the direction of arrow2.
DISTRONIC Plus is activated and the
current speed is set.

Remove your foot from the accelerator
pedal.Setting a higher speed
You can increase the set speed in two stag-
es.
Adjustment in 1 mph (Canada: 1 km/h)
increments

Briefly lift the DISTRONIC Plus lever to
the resistance point in direction of
arrow1 (
page 381).

Release the DISTRONIC Plus lever.
The vehicle speed increases in incre-
ments of 1 mph (Canada: 1 km / h).
Adjustment in 5 mph
(Canada: 10 km/h) increments
i
After a short while, your vehicle is secured in
place by the electric parking brake so that the
operating brake can be relieved of load.
i
Depending on the following distance set us-
ing the distance setting switch on the DISTRON-
IC Plus lever, your vehicle will stop approx.
13.1 ft. (4 m) away from the vehicle in front of
you.
i
If you do not take your foot off of the accel-
erator completely, the following message will ap-
pear in the multifunction display:
DISTRONIC PLUS passive
The distance to a slower moving vehicle in front
of you will not be set. Your vehicle speed will
then be determined only by the accelerator ped-
al position.
i
The set speed value is increased in 1 mph
(Canada: 1 km/h) increments each time you lift
the DISTRONIC Plus lever to the resistance
point.
Warning!
G
You can increase the vehicle speed in 5 mph
(Canada 10 km/h) increments. When using
this feature, keep in mind that it may take a
brief moment until the vehicle has reached
the set speed.
Increase the vehicle speed to a value that
the prevailing road conditions permit. Other-
wise, sudden and unexpected acceleration
of the vehicle could cause an accident
and/or serious injury to you and others.i
The set value is increased in 5 mph
(Canada: 10 km/h) increments each time you lift
the DISTRONIC Plus lever past the resistance
point.